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currently i working on plotting a graph of rpm sensor on matlab but unfortunately when i run the plotting coding in Matlab it was failed.It said 'Warning: Unsuccessful read: Matching failure in format.' please help me,i dont know what is the problem

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volatile int rpmcount = 0;
int rpm = 0;
unsigned long lastmillis = 0;
void setup(){
Serial.begin(9600);
attachInterrupt(0, rpm_car, FALLING);//interrupt cero (0) is on pin two(2).
}
void loop(){
if (millis() - lastmillis == 1000){ //Uptade every one second, this will be equal to reading frecuency (Hz).
detachInterrupt(0); //Disable interrupt when calculating
rpm = rpmcount * 60; // Convert frecuency to RPM, note: this works for one interruption per full rotation. For two interrups per full rotation use rpmcount * 30.
Serial.print("RPM =\t"); //print the word "RPM" and tab.
Serial.print(rpm); // print the rpm value.
Serial.print("\t Hz=\t"); //print the word "Hz".
Serial.println(rpmcount); //print revolutions per second or Hz. And print new line or enter.
rpmcount = 0; // Restart the RPM counter
lastmillis = millis(); // Uptade lasmillis
attachInterrupt(0, rpm_car, FALLING); //enable interrupt
}
}
void rpm_car(){ // this code will be executed every time the interrupt 0 (pin2) gets low.
rpmcount++;
}

Antworten (2)

Image Analyst
Image Analyst am 11 Nov. 2014
This is C or Java code, not MATLAB code. Use MATLAB instead.
  4 Kommentare
Walter Roberson
Walter Roberson am 3 Jun. 2018
You have the Arduino sending "RPM =" and "Hz=" but your MATLAB code is expecting only numeric values.

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Osama Yassin
Osama Yassin am 3 Jun. 2018
Hi, Nazrin Zaini .. did get the solution about attachInterrupt function in matlab?

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